I have used several different book readers including Google Books and iBooks but have found the Amazon Kindle app to be the best software to read books on the go. The Kindle Reader is also one of the best ebook readers you can come across.
However, there may be times when you already have books from other sources which you would want to read on your Kindle app or Amazon Kindle. If you have an Amazon Kindle, you can easily upload books from your computer to your Kindle library by connecting it to your PC.
If you are using a Kindle app on Android or iPhone device, you do not have this feature. You can use several other methods though to upload your personal eBooks and documents to Kindle.
One of easiest way to upload your personal documents and books to your Kindle library is to send the books through email to your personal Kindle email address which can be found at this page. To be able to use this service, you will have to register your device for Personal documents and then also add approved email addresses from which you can send documents to your Kindle.
In addition to that, you can also use an app called “Send to Kindle” which will allow you to upload documents directly from your PC or Mac to your Personal Documents in Kindle library, while also allowing you to directly send those books or documents to your registered Kindle device.
While using the “Send to Kindle” app, your documents will be converted to a Kindle specific output which you can then read using the Kindle app or Kindle reader device.